Say, is the pyroclastic less glossy than the black? It looks that way on the website.

Not really. Sometimes when I choose a particular photograph to make a chip from it may or may not have been using flash or at an angle where you can see the gloss. I pick based on which best shows the color as close as possible.

Also, The actual gloss level/sheen of the chips we make varies at times because of the speed we need to make them. Sometimes we have to force dry them and I think that's when the gloss is lower than curing naturally. You may also be seeing that variation in the chips on the website.

For the most part, everything cures with a low satin sheen. The temperature in our warehouse also affects this when we are making chips in cold vs warmer temps